bg-image($url)
  background-image url($url + "@2x.png")
  @media (-webkit-min-device-pixel-ratio 3)
    background-image url($url + "@3x.png")

no-wrap()
  text-overflow ellipsis
  overflow hidden
  white-space nowrap

extend-click()
  position relative
  &:before
    content ''
    position absolute
    top -0.2rem
    left -0.2rem
    right -0.2rem
    bottom -0.2rem